Outdoor Power Equipment (Lawn Mowers, Snow Blowers, Chain Saws and more) Discussions

Is there a low cost and easy way to convert my B&S 15.5 Snow Series Max engine to a 16.5?

Since both engines are 342cc it can`t be to much different. Does anyone now?

It isn`t very important since my engine is powerful , but if it don`t cost to much it vould sure be nice to have the extra tourqe.

I took of 3 millimeter and i now only use 98octane (Norway)

I like it!  A high compression high performance snowblower engine.  I have no doubt that you have way more horsepower than the average 15.5 or 16.5.  What changes did you make to the spark?  Did you advance the timing?

It`s no way of advancing the timing as the coil is fixed.

The only adjustment i was able to do, was to minimize the distance between the coil and the flywheel,

in order to create the strongest spark possible. The smaler the gap, the stronger the spark!

I did that by losning the bolts holding the coil and then put a piece of paper between the coil and flywheel and then

fastening the bolts again. Then remove the paper and rotate the flywheel in order to check that it run freely.

As my flywheel was not 100% round i had to do this a couple of times.

I`m gonna make a custom bracket to hold the coil that makes me able to adjust the timing.

I just didn`t have the time at this moment. I read somewhere that the optimal timing was 26 degree`s.

I don`t know what the original timing is, but from what i understand it will mayby give me 1-2 HP more.

Also here are som more pictures of where this "plastic manifold" sits on the engine!

   

Great info & pic . Thank you.

whitetail wrote:

Just happy to help. Will post more pictures when i finish my " Adjustable coil bracket mod".